redirect

app/routes/auth.py

@@ -44,7 +44,15 @@ async def auth_callback(request: Request):
         return HTMLResponse("<h1>Session state not found. Please /login again.</h1>", status_code=400)
 
     flow = create_flow()
-    flow.fetch_token(authorization_response=str(request.url))
+    # flow.fetch_token(authorization_response=str(request.url))
+
+    flow.redirect_uri = GOOGLE_REDIRECT_URI  # optional, for clarity
+
+    # IMPORTANT: pass `redirect_uri` again here:
+    flow.fetch_token(
+        authorization_response=str(request.url),
+        redirect_uri=GOOGLE_REDIRECT_URI
+    )
 
     # Get the credentials object
     credentials = flow.credentials